Contacts of the helix formed by residues 649 - 672 (chain B) in PDB entry 1JB0


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with LEU 649 (chain B).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    116B  TYR*     5.9     0.7    -      -       -      +
    636B  GLN*     4.3    18.4    -      -       +      +
    637B  LEU      4.3     2.7    -      -       -      +
    640B  GLY*     3.5     8.2    -      -       -      -
    647B  ASN*     2.7    21.3    -      -       -      +
    648B  ASN*     1.3    91.5    -      -       -      +
    650B  SER*     1.3    65.6    +      -       -      +
    651B  VAL      3.2     1.8    -      -       -      -
    652B  TRP*     3.4    23.3    +      -       +      +
    653B  ALA*     3.0    23.9    +      -       -      +
    733B  ALA*     4.1    22.2    -      -       +      +
    736B  ALA*     4.7    13.5    -      -       +      -
    737B  ALA*     3.9    28.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 650 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    467A  ALA      4.0    16.8    +      -       -      -
    103B  PHE*     3.3    19.4    -      -       -      -
    640B  GLY*     3.5    22.5    +      -       -      -
    641B  TYR*     3.9    10.2    -      -       -      -
    646B  THR*     4.2     5.5    -      -       -      -
    647B  ASN      2.9    17.0    +      -       -      -
    649B  LEU*     1.3    77.0    -      -       -      +
    651B  VAL*     1.3    67.7    +      -       -      +
    653B  ALA*     3.3     1.6    +      -       -      +
    654B  TRP*     3.0    24.6    +      -       -      +
   1206B  CLA      3.6    10.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 651 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    103B  PHE*     3.3    30.5    -      -       +      -
    113B  ASP*     5.4     0.2    -      -       -      +
    648B  ASN      4.1     7.9    -      -       -      +
    650B  SER*     1.3    77.1    +      -       -      +
    652B  TRP*     1.3    62.3    +      -       +      +
    654B  TRP*     3.0     7.8    +      -       -      +
    655B  MET*     2.7    35.8    +      -       -      +
   1205B  CLA      4.0    25.1    -      -       +      -
   1206B  CLA      3.4    49.4    -      -       +      -
   4017B  BCR      4.2    12.3    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 652 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    114B  ILE      5.6     0.2    -      -       -      -
    116B  TYR*     4.1    16.2    +      +       -      -
    637B  LEU*     3.5     2.8    -      -       +      +
    648B  ASN      4.2     3.4    +      -       -      -
    649B  LEU*     3.4    34.5    +      -       +      +
    651B  VAL*     1.3    89.4    -      -       +      +
    653B  ALA*     1.3    57.1    +      -       -      +
    655B  MET*     3.9    21.5    -      -       +      -
    656B  PHE*     2.8    30.5    +      -       -      +
    728B  ALA      4.7     0.2    -      -       -      -
    729B  ALA*     3.2    22.7    -      -       -      +
    732B  ILE*     3.6    36.2    -      -       +      +
    733B  ALA*     3.9    24.2    -      -       +      -
   1205B  CLA      3.5    47.8    -      -       +      -
   1224B  CLA      4.3    22.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with ALA 653 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647A  ASN*     4.9     7.2    +      -       -      +
    637B  LEU*     3.1    32.3    -      -       -      +
    638B  ILE*     5.0     2.5    -      -       +      -
    640B  GLY*     4.0    10.8    -      -       -      +
    641B  TYR*     4.1    15.0    -      -       +      +
    649B  LEU      3.0    14.3    +      -       -      +
    650B  SER      3.7     4.3    -      -       -      +
    652B  TRP*     1.3    76.9    -      -       -      +
    654B  TRP*     1.3    62.8    +      -       -      +
    656B  PHE*     3.3     6.1    -      -       -      +
    657B  LEU*     3.2    26.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with TRP 654 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463A  ASP      4.3     1.8    -      -       -      -
    464A  THR*     3.1    31.9    +      -       -      -
    467A  ALA*     4.4     1.1    -      -       +      -
   1022A  CLA      3.5    69.9    -      -       +      +
   1132A  CLA      5.1     0.2    -      -       +      -
    641B  TYR*     4.0    16.5    -      -       +      -
    650B  SER      3.0    14.1    +      -       -      +
    651B  VAL*     3.4     7.4    -      -       -      +
    653B  ALA*     1.3    74.7    -      -       -      +
    655B  MET*     1.3    64.3    +      -       -      +
    657B  LEU*     3.0     6.8    +      -       -      +
    658B  PHE*     2.8    42.6    +      +       +      +
   1206B  CLA      3.4    40.1    -      -       +      +
   4017B  BCR      3.7    46.7    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 655 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    651B  VAL      2.7    19.8    +      -       -      +
    652B  TRP*     3.8    21.3    -      -       +      +
    654B  TRP*     1.3    76.2    -      -       -      +
    656B  PHE*     1.3    53.8    +      -       -      +
    658B  PHE*     3.2     8.7    -      -       -      +
    659B  GLY*     2.8    32.4    +      -       -      -
    725B  LEU*     4.1    28.9    -      -       +      +
    729B  ALA*     4.1     3.4    -      -       +      -
   1205B  CLA      3.6    49.8    -      -       +      -
   1224B  CLA      3.5    25.1    -      -       +      -
   4017B  BCR      4.0    25.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with PHE 656 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    647A  ASN*     6.2     0.2    -      -       -      -
    650A  LEU*     3.7    20.6    -      -       +      -
    634B  SER*     5.0     0.2    -      -       -      -
    637B  LEU*     3.7    19.7    -      -       +      -
    638B  ILE*     3.3    31.4    -      -       +      -
    652B  TRP      2.8    20.2    +      -       -      +
    653B  ALA*     3.3     9.9    -      -       -      +
    655B  MET*     1.3    77.4    -      -       -      +
    657B  LEU*     1.3    60.8    +      -       +      +
    659B  GLY      3.5     0.3    +      -       -      -
    660B  HIS*     2.9    38.0    +      +       -      -
    726B  THR*     3.3    41.4    +      -       +      +
    729B  ALA*     3.7     9.0    -      -       +      -
    730B  PHE*     3.9     9.9    -      -       +      -
   1021B  CLA      3.5    35.9    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 657 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    463A  ASP*     3.5    12.1    -      -       -      +
    646A  ILE*     4.0    13.9    -      -       +      -
    647A  ASN*     3.6    20.4    -      -       +      +
    650A  LEU*     3.7    33.4    -      -       +      -
   1022A  CLA      3.4    42.4    -      -       +      +
    641B  TYR*     3.3    26.7    -      -       -      +
    653B  ALA      3.2     9.1    +      -       -      +
    654B  TRP      3.0     7.6    +      -       -      +
    656B  PHE*     1.3    75.7    -      -       +      +
    658B  PHE*     1.3    65.8    +      -       -      +
    660B  HIS*     3.1    11.3    +      -       +      +
    661B  LEU*     3.0    18.9    +      -       -      +
----------------------------------------------------------
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Residues in contact with PHE 658 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1022A  CLA      3.7    36.7    -      -       +      +
    654B  TRP*     2.8    24.8    +      +       +      +
    655B  MET*     3.2    12.8    -      -       -      +
    657B  LEU*     1.3    77.4    -      -       -      +
    659B  GLY*     1.3    61.6    +      -       -      +
    661B  LEU*     3.1     6.0    +      -       +      +
    662B  VAL*     3.0    34.2    +      -       +      +
    725B  LEU*     3.3    33.9    -      -       +      -
   1226B  CLA      3.9    14.8    -      -       +      -
   1239B  CLA      3.5    30.3    -      -       +      -
   4017B  BCR      3.6    44.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLY 659 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    655B  MET      2.8    18.3    +      -       -      -
    658B  PHE*     1.3    73.7    -      -       -      +
    660B  HIS*     1.3    63.4    +      -       -      +
    662B  VAL*     3.4     0.6    +      -       -      -
    663B  TRP*     3.0    21.7    +      -       -      +
    722B  GLY*     3.2    22.1    -      -       -      -
    725B  LEU*     4.1     7.0    -      -       -      -
    726B  THR*     2.9    23.8    -      -       -      -
----------------------------------------------------------
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Residues in contact with HIS 660 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    650A  LEU*     5.3     2.0    -      -       +      +
   1022A  CLA      3.0    48.2    -      -       +      +
    656B  PHE*     2.9    45.1    +      +       -      +
    657B  LEU*     3.1    13.9    +      -       +      +
    659B  GLY*     1.3    76.1    -      -       -      +
    661B  LEU*     1.3    62.1    +      -       -      +
    663B  TRP*     3.6     1.9    -      -       -      +
    664B  ALA*     3.1    24.9    +      -       -      +
    726B  THR*     3.1    29.2    +      -       +      +
   1021B  CLA      2.4    57.2    +      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 661 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    456A  PHE*     4.3    17.0    -      -       +      -
   1022A  CLA      3.7    65.9    -      -       +      +
    657B  LEU      3.0    11.5    +      -       -      +
    658B  PHE*     3.1     9.8    +      -       +      +
    660B  HIS*     1.3    75.8    -      -       -      +
    662B  VAL*     1.3    55.7    +      -       -      +
    664B  ALA*     3.4     1.7    +      -       -      -
    665B  THR*     2.7    39.5    +      -       -      +
   1023B  CLA      3.9    16.4    -      -       +      +
   1239B  CLA      3.5    39.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with VAL 662 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    658B  PHE*     3.0    36.5    +      -       +      +
    659B  GLY*     4.0     3.1    -      -       -      +
    661B  LEU*     1.3    72.8    -      -       -      +
    663B  TRP*     1.3    65.1    +      -       -      +
    665B  THR*     3.3     7.8    +      -       -      -
    666B  GLY      3.1    16.5    +      -       -      -
    718B  HIS*     3.2    42.2    -      -       +      +
    721B  VAL*     4.0    11.9    -      -       +      -
    722B  GLY*     3.8    11.2    -      -       -      +
   1239B  CLA      3.6    38.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 663 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    683A  TRP*     3.7    15.0    -      +       -      -
   1011A  CLA      4.1     3.1    -      -       +      -
   1022A  CLA      3.2    37.9    -      +       +      -
    659B  GLY      3.0    17.8    +      -       -      +
    660B  HIS      3.6     2.5    -      -       -      +
    662B  VAL*     1.3    77.9    -      -       -      +
    664B  ALA*     1.3    73.2    +      -       -      +
    666B  GLY*     3.0    12.1    +      -       -      -
    667B  PHE*     3.3    49.4    +      +       -      -
    718B  HIS      4.0     8.3    -      -       -      -
    719B  PHE*     3.2    50.9    -      +       -      +
    722B  GLY*     3.9     4.0    -      -       -      -
    723B  TYR*     4.1     9.2    -      -       -      -
   1012B  CLA      3.6    11.4    -      -       +      -
   1021B  CLA      3.2    59.3    -      +       +      +
----------------------------------------------------------
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Residues in contact with ALA 664 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
   1022A  CLA      3.3    41.5    -      -       +      +
    660B  HIS      3.1    11.3    +      -       -      +
    661B  LEU      4.0     0.2    -      -       -      +
    663B  TRP*     1.3    86.7    -      -       -      +
    665B  THR*     1.3    60.5    +      -       -      +
    667B  PHE*     3.1    24.8    +      -       -      +
    668B  MET      3.8     2.6    +      -       -      -
   1023B  CLA      3.2    29.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with THR 665 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    661B  LEU      2.7    22.1    +      -       -      -
    662B  VAL*     3.6     7.8    -      -       -      -
    663B  TRP      3.1     0.4    -      -       -      -
    664B  ALA*     1.3    78.3    -      -       -      +
    666B  GLY*     1.3    60.7    +      -       -      +
    668B  MET*     3.1    27.8    +      -       +      +
    669B  PHE*     3.4    11.7    -      -       +      -
    718B  HIS*     3.6    21.3    -      -       +      +
   1023B  CLA      3.2    28.1    -      -       +      +
   1239B  CLA      3.7    35.0    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 666 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    662B  VAL      3.1     6.3    +      -       -      -
    663B  TRP      3.0     9.5    +      -       -      -
    665B  THR*     1.3    76.0    -      -       -      +
    667B  PHE*     1.3    63.0    +      -       -      +
    668B  MET      3.1     0.7    +      -       -      -
    669B  PHE*     3.2     3.9    +      -       -      -
    670B  LEU*     3.1    31.5    +      -       -      +
    715B  GLY*     3.6    14.1    -      -       -      -
    718B  HIS*     3.4    23.7    -      -       -      +
    719B  PHE*     4.2     1.3    -      -       -      -
----------------------------------------------------------
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Residues in contact with PHE 667 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    683A  TRP*     3.8    15.0    -      +       -      -
    687A  LEU*     3.7    34.5    -      -       +      -
    691A  PHE*     4.0    15.0    -      +       -      -
    735A  TYR*     4.6     5.8    -      +       -      -
   1022A  CLA      4.2     9.4    -      -       +      -
    663B  TRP*     3.3    61.7    -      +       -      -
    664B  ALA*     3.1    16.9    +      -       +      +
    666B  GLY*     1.3    78.5    -      -       -      +
    668B  MET*     1.3    62.1    +      -       -      +
    670B  LEU*     4.3     6.7    -      -       -      -
    671B  ILE*     3.0    43.4    +      -       +      +
    719B  PHE*     3.7    16.8    -      +       -      -
   1023B  CLA      3.3    14.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 668 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    664B  ALA      3.8     0.6    +      -       -      -
    665B  THR*     3.1    13.8    +      -       +      +
    666B  GLY      3.1     1.0    -      -       -      -
    667B  PHE*     1.3    78.5    -      -       -      +
    669B  PHE*     1.3    73.6    +      -       +      +
    672B  SER*     2.8    35.2    +      -       -      +
    677B  TRP*     4.2     4.7    -      -       +      -
   1023B  CLA      2.6    88.1    -      -       +      +
   1239B  CLA      3.8    32.1    -      -       +      -
   2002B  PQN      3.4    24.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 669 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    665B  THR*     3.4    25.6    -      -       +      -
    666B  GLY*     3.2     6.0    +      -       -      -
    668B  MET*     1.3    80.8    -      -       +      +
    670B  LEU*     1.3    60.7    +      -       -      +
    672B  SER      3.3    11.1    -      -       -      +
    673B  TRP*     4.3     3.5    +      -       -      -
    706B  LEU*     3.9    20.9    -      -       +      -
    711B  ALA*     3.5    30.6    -      -       +      +
    712B  ARG*     5.4     0.2    -      -       -      -
    714B  VAL*     4.0    17.7    -      -       +      -
    715B  GLY*     3.6    10.3    -      -       -      -
    718B  HIS*     3.9    20.0    -      +       -      -
   1239B  CLA      3.5    39.9    -      +       +      -
   2002B  PQN      3.2    49.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with LEU 670 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    690A  LEU      3.2    12.4    -      -       -      +
    691A  PHE*     3.6    35.0    -      -       +      -
    583B  TYR*     3.2    40.0    +      -       +      +
    587B  PHE*     3.7    24.0    -      -       +      -
    666B  GLY      3.1    24.0    +      -       -      +
    667B  PHE      4.0     0.7    -      -       -      +
    669B  PHE*     1.3    77.9    -      -       -      +
    671B  ILE*     1.3    57.5    +      -       -      +
    673B  TRP*     3.0    18.6    +      -       -      +
    712B  ARG*     4.0     7.2    -      -       -      +
    715B  GLY*     3.8    13.2    -      -       -      +
    716B  LEU      3.8    13.5    -      -       -      +
    719B  PHE*     4.3     6.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with ILE 671 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    588A  GLN*     3.1    19.8    +      -       -      +
    596A  PHE*     4.0    14.3    -      -       +      -
    597A  LEU*     4.8     0.2    -      -       +      -
    600A  PHE*     3.8    42.6    -      -       +      -
    687A  LEU*     5.0     0.2    -      -       +      -
    690A  LEU*     4.1    21.5    -      -       +      +
    691A  PHE*     3.7    26.2    -      -       +      -
    735A  TYR*     4.5     5.6    -      -       +      -
    667B  PHE*     3.0    34.3    +      -       +      +
    670B  LEU*     1.3    78.1    -      -       -      +
    672B  SER*     1.3    62.1    +      -       -      +
    673B  TRP*     3.4     4.2    +      -       -      -
   1023B  CLA      3.8    20.9    -      -       +      -
----------------------------------------------------------
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Residues in contact with SER 672 (chain B). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    588A  GLN*     3.6     5.2    -      -       -      -
    597A  LEU*     3.6    27.4    -      -       -      -
    668B  MET*     2.8    21.8    +      -       -      +
    669B  PHE      3.3     5.0    -      -       -      +
    671B  ILE*     1.3    74.8    -      -       -      +
    673B  TRP*     1.3    68.7    +      -       -      +
    677B  TRP*     2.9    30.0    +      -       -      -
   1023B  CLA      4.4    11.9    -      -       -      +
   2002B  PQN      3.0    19.1    +      -       -      -
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il